Ventilator for chimneys



Sept. 25, 1928.

A. M DONALD ET AL VENTILATOR FOR CHIMNEYS Filed May 1, 1926 Patented Sept. 25, 1928 1 UNITED STATES.

PATENT, mm

ALEXANDER MCDONALD, or PITTSBURGH, ANDVWILLIAM 0. SMITH, or. wILKINsiiURs,

PENNSYLVANIA, ASSIGNORS or SEVENTY ONE-HUNDREDTHS To JOHN .o. YOUNG, v

or PITTSBURGII, PENNSYLVANIA, AND THIRTY ONE-HUNDREDTHS To SAID SMITH.

V vENTILAToR r03 crInvIN Ys.

Application aied na 1, 1926. Serial mas- :The invention relates to a chimney venti lator of the type disclosed in application for patent filed by the same applicants on F ebruary 27th, 1926, Serial No. 91,121, and has for its object the improvement of the structure shown in the application referred to wherebycurrents of air striking the corners of the ventilating member may be deflected and directed upwardly to create an upward draft within the chimney to which the ventilater is secured to add to the efficiency of the chimney.

In the former application, hereinloefore referred to, a current of air striking directly against the sides of the pyramidal member would be directed upwardly and the ventilator would operate efficiently. lVhen, however, the current of air Strikes the Ventilator in the direction of the corner thereof, the

tendency would be to blow straight across or slightly upwardly of a horizontal line, but the efficiency of the ventilator would not be as marked as where thecurrent of air strikes directly against the sides. This difliculty is overcome in the invention to be hereinafter described by providing ribs on the sides of the ventilator and arrangedrperpendicularly thereof and extending on planes substantially perpendicular to the base of the ventilator so that currents of air striking any one of the corners will by engaging the.

ribs be deflected upwardly as will currents of air striking against the sides. I

The invention will be described in detail hereinafter and will be found illustrated in the accompanying drawings, in which Figure 1 is a horizontal sectional View of the preferred form of ventilator showing it'attached to the upper section of a chimney,

- Figure 2 a top plan view of the form shown in Figure 1,

Figure 3 a side view,

Figure 4 a top plan view showing the chimney removed, 7

Figure 5 a modified form, and

Figure 6 a top plan view of the form shown in Figure 5.

In the drawings similar reference characters will be used to designate corresponding parts throughout the several views.

horizontal sectional view of a Tn Figures 1 and 2 one form of the Ventilator is shown applied to the upper s'ection'of the chimney designated 1 and comprises a pyramidal member 2, having. the four inclined sides designated 3, and a vertical extension 4 that encloses the chimney 1 and is adapted to be secured thereto by any suitable means adjacent to its top edge. As illustrated in the drawings the pyramidal member 2 is formed vof sections of sheet metal that are adapted to be secured together by any suitable means, and said sections'may be shipped unconnected and the sections connected in place to conform to the sides ofthe chimney to which'it is to be applied, or the sections may be arranged to beadjustably, securedtogether as is hereinafter indicated, and will be described in connection with a modified form in Figures 5 and '6.- Secured to: each of the sides'of the pyramidal member; 2 is an upstanding rib 5 that is arranged substantiallyperpendicular to the surface of the side of the member, in each instance, and extends on a plane substantially perpendicular to the base of the side 3.

In the modified form shown in Figures 5 and 6 two correspondingly shaped truncated pyramidal members are arranged, the'inner member being designated 6 and the outer member being designated 7 and each of the members are formed of separable sections that are adapted to be adjustably connected by means of screw bolts 8 or any other suitable connecting means may be substituted therefor. T he member 6 has a vertical extension 9 and-the member 7 the vertical extension 10,

said vertical extensions being secured together by means of screw boltsll-having spacing sleeves 12 thereon to properly space the members from one another, and the ver tical extension 9 is adapted to be secured to 'thelupper section of the chimney in the same manner as that Shown in Figures 1 and 2, or

by any other suitable means. The sides of members 6 and 7 are spaced from one another at a greater distance at their bases than at theirtops, as shown in Figure 5, that is,

the two members converge toward one another toward the top. By such a structure 1t will be apparent that a currentof air entering between. the two members will emerge from the top of the ventilator at a greater speed than it enters between the members, thus adding to the efiiciency of the operation of the venin an upward direction at whatever angle the current of air may strike the ventilator, spacing ribs 13 are provided between the inner lnerease the velocity of the air currents and outer members 6 and 7 ,said spacing ribs being arranged perpendicularly to the contiguous surfaces of said members and also extending perpendicularly to the bases of said members. 14 indicateother ribs secured to the upper sides of the outer'membe'r 7 and serve thesame purpose as the ribs 5 in the form 'illu stratedin Figures 1 to 4. \Vhat is claimed is 3- I chimne ventilator comprising correspondinglys apedinner and outer trun- Cated pyramidal members or frustums spaced fom each'other, the sides of the members being arrange in upwardly converging planes to taper thefspace between them and ing supwardly through the said space, said memb rs having spaced vertical sections fol-me as extensions of the sides of the said members arranged oppositeeach other to form :a vertical passage to, change the di-' rection of the currents fromlnchned to yertica' .tq stimulatethe draft of the chimney and to prevent the said air currents irom sweeping across the top of the chimney and choking 'thesa'm'e, said inner and outer fruspass-- vertical portions located at the vertical section of the router frustum, said vanes being adapted to cause currents of air to move upwardly over the outer frustuin and to have their direction changed from inclined to vertical at the top of the chimney ventilator.

'2. A chimney ventilator having an upwardly and inwardly inclined member consisting ofa truncated frust'um provided at the top with a vertical section formed as extensions of the sides of the frustu'm, and exterior vanes extending from the top to the bottom of the said frustums for causing-currents of air to pass upwardly over the frustumand having vertical upper portions located at the vertical sections the Verticalportions ofthe vanes and the, vertical sections changing the-direction of the air currents from inclined to vertical to prevent the air currents from sweeping across thetop of the chimney and choking the same and for causi'ng the said air currents to stimulate the draft from the chimney. I

In testimony whereof we affix our signatures.

' ALEXANDER MCDONALD.

WILLIAM 0. SMITH. 

